19919809

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{41}}^1\times {\mathrm{281}}^1$

素因数の和:361

約数の個数: 32

約数和(自身を含む): 26530560

約数和(自身を除く): 6610751

約数列:

[1, 7, 13, 19, 41, 91, 133, 247, 281, 287, 533, 779, 1729, 1967, 3653, 3731, 5339, 5453, 10127, 11521, 25571, 37373, 69407, 70889, 80647, 149773, 218899, 485849, 1048411, 1532293, 2845687, 19919809]

約数ペア:

[(1, 19919809), (7, 2845687), (13, 1532293), (19, 1048411), (41, 485849), (91, 218899), (133, 149773), (247, 80647), (281, 70889), (287, 69407), (533, 37373), (779, 25571), (1729, 11521), (1967, 10127), (3653, 5453), (3731, 5339)]